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Sabine Lisicki of Germany hits a backhand return to Flavia Pennetta of Italy meet at the net following their quarterfinal match at the BNP Paribas Tennis Open in Indian Wells, California on March 19, 2015. Lisicki defeated Pennetta 6-4, 6-7 (3), 7-6 (4). AFP PHOTO/ FREDERIC J. BROWN (Photo credit should read FREDERIC J. BROWN/AFP/Getty Images)

Sabine Lisicki of Germany hits a backhand return to Flavia Pennetta of Italy meet at the net following their quarterfinal match at the BNP Paribas Tennis Open in Indian Wells, California on March 19, 2015. Lisicki defeated Pennetta 6-4, 6-7 (3), 7-6 (4). AFP PHOTO/ FREDERIC J. BROWN        (Photo credit should read FREDERIC J. BROWN/AFP/Getty Images)